Reflow soldering jig

Abstract

The utility model discloses a reflow soldering jig, and belongs to the technical field of auxiliary devices for welding. The reflow soldering jig comprises a frame body and a circuit board, the circuit board is installed in the frame body, and the reflow soldering jig further comprises a plurality of sets of piston cylinders which are fixedly connected in the frame body at equal intervals; the air bag is fixedly connected to the telescopic end of the piston cylinder; the inner pipe is connected into the piston cylinder, and the inner pipe is connected with an air bag; the pressure sensor is connected in the air bag; the connecting pipe is connected to the piston cylinder, an electronic valve is arranged at the joint of the connecting pipe and the piston cylinder, and air is supplied into the piston cylinder through the connecting pipe; through the arrangement of the piston cylinder and the air bag, the air bag on the piston cylinder is continuously close to an element at the bottom of the circuit board through continuous air injection, when the air bag and the element are in extrusion contact, a pressure sensor in the air bag sends out a signal and then stops moving upwards, and the bottom of the circuit board is lifted upwards; and the sinking of the element under the action of self gravity is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding auxiliary device technical field, especially relates to reflow soldering fixture. BACKGROUND

[0002] The circuit assembly technology welded and assembled by reflow soldering or immersion soldering is a kind of assembly technology that surface-mounted components are directly pasted and welded to the surface of the circuit board without drilling and inserting holes in the circuit board.

[0003] During reflow soldering, the circuit board passes through the reflow soldering furnace horizontally, and the solder paste is heated and remelted to complete welding with components, and the front and back surfaces of the circuit board are generally assembled with components, when welding, the bottom components will sink under the action of their own weight, and a certain gap will be generated between the components and the circuit board, which will cause false welding and affect the use of components.

[0004] Therefore, the reflow soldering fixture is provided to solve the above problems. SUMMARY

[0005] The utility model discloses a reflow soldering fixture to solve the problems in the above background technology.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The reflow soldering fixture comprises a frame body and a circuit board, the circuit board is installed in the frame body, and further comprises:

[0008] A plurality of piston cylinders are fixedly connected in the frame body at equal intervals;

[0009] An air bag is fixedly connected to the telescopic end of the piston cylinder;

[0010] An inner tube is connected in the piston cylinder, and the inner tube is connected with the air bag;

[0011] A pressure sensor is connected in the air bag;

[0012] A connecting pipe is connected to the piston cylinder, and an electronic valve is arranged at the connection position of the connecting pipe and the piston cylinder, air is supplied to the piston cylinder through the connecting pipe, the telescopic end of the piston cylinder moves upward, and then abuts against the components at the bottom of the circuit board.

[0013] In order to facilitate the limitation of the circuit board, preferably, a limiting plate is connected to the frame body, and connecting holes are arranged on the frame body and the limiting plate.

[0014] In order to facilitate the installation of the circuit board, preferably, a recess is arranged in the frame body, and the circuit board is clamped on the recess.

[0015] In order to increase stability, preferably, a positioning bolt is threadedly connected on the limiting plate, and the positioning bolt is used for abutting against the circuit board from above.

[0016] In order to facilitate assembly, preferably, a cavity is arranged in the frame body, and the connecting pipe is arranged in the cavity.

[0017] Preferably, a plurality of branch pipes are connected on the connecting pipe, the branch pipes are connected with the piston cylinder, and the electronic valve is arranged in the branch pipe.

[0018] In order to facilitate installation, preferably, an installation plate is fixedly connected on the telescopic end of the piston cylinder, and the air bag is arranged on the installation plate.

[0019] Compared with the prior art, the reflow soldering jig has the following beneficial effects:

[0020] The piston cylinder and the air bag are arranged, the air bag on the piston cylinder is continuously close to the element at the bottom of the circuit board through continuous air injection, when the two are extruded and contacted, the pressure sensor in the air bag sends a signal, and then the upward movement is stopped, the bottom of the circuit board is lifted upward, and the sinking of the element under the action of the gravity is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure diagram of the reflow soldering jig Figure 1 ;

[0022] Figure 2 Structure diagram of the reflow soldering jig Figure 2 ;

[0023] Figure 3 Structure diagram of the reflow soldering jig Figure 1 ;

[0024] Figure 4 The reflow soldering jig Figure 3 Structure diagram of part A of the reflow soldering jig

[0025] Figure 5 Structure diagram of the reflow soldering jig Figure 2 .

[0026] In the figure: 1, frame body; 101, cavity; 2, limiting plate; 201, positioning bolt; 3, circuit board; 4, piston cylinder; 401, inner pipe; 5, installation plate; 6, air bag; 7, pressure sensor; 8, connecting pipe. DETAILED DESCRIPTION

[0027] Clearly, the described embodiments are merely a part of the embodiments of the present utility model, rather than all the embodiments.

[0028] Embodiment 1:

[0029] With reference to Figures 1-4 , the reflow soldering fixture comprises a frame body 1, a circuit board 3, the circuit board 3 is installed in the frame body 1, further comprising: a plurality of piston cylinders 4, the piston cylinders 4 are fixedly connected in the frame body 1 at equal intervals; an air bag 6, the air bag 6 is fixedly connected to the telescopic end of the piston cylinder 4; an inner tube 401, the inner tube 401 is connected in the piston cylinder 4, the inner tube 401 is connected with the air bag 6; a pressure sensor 7, the pressure sensor 7 is connected in the air bag 6; a connecting pipe 8, the connecting pipe 8 is connected to the piston cylinder 4, an electronic valve is arranged at the connecting position of the connecting pipe 8 and the piston cylinder 4, air is supplied into the piston cylinder 4 through the connecting pipe 8, the telescopic end of the piston cylinder 4 moves upward, and then abuts against the elements at the bottom of the circuit board 3, a limiting plate 2 is connected to the frame body 1, connecting holes are arranged on the frame body 1 and the limiting plate 2, a recess is arranged in the frame body 1, the circuit board 3 is clamped in the recess, an installation plate 5 is fixedly connected to the telescopic end of the piston cylinder 4, and the air bag 6 is installed on the installation plate 5.

[0030] When the device is used, the circuit board 3 to be reflow soldered is installed in the clamping groove of the frame body 1, at this time, as shown in Figure 3 , the connecting pipe 8 can be connected with the air supply device, the air supply device can be an air pump, with the entry of the gas, the gas will gradually fill the piston cylinder 4, at this time, the gas will enter the air bag 6 through the inner tube 401, the air bag 6 expands, when the air bag 6 expands to the limit, the gas will accumulate in the piston cylinder 4, the telescopic end of the piston cylinder 4 gradually moves, and then the air bag 6 continuously approaches the circuit board 3, at this time, the air bag 6 abuts against the elements at the bottom of the circuit board 3, avoiding the sinking of the elements under the action of the gravity of the elements, and at the same time, because the air bag 6 is in contact with the circuit board 3, the air bag 6 will be compressed and deformed, because the air bag 6 is in the filling state originally, the inside is full of gas, the pressure is constant, and with the change of the shape, the gas pressure in the air bag 6 changes, at this time, the pressure sensor 7 senses the change of the air pressure and sends a signal, at this time, the electronic valve on the piston cylinder 4 is closed, the gas cannot continue to enter, at this time, the telescopic end of the piston cylinder 4 does not continue to move upward, and the circuit board 3 at the bottom is lifted.

[0031] Because the air bag 6 has gas inside and is soft, at this time, the elements at the bottom of the circuit board 3 will not be excessively extruded to deform or displace.

[0032] Subsequently, the frame body 1 can be placed in the reflow soldering device to perform reflow soldering.

[0033] Embodiment 2:

[0034] Referring to Figures 1-5 , the reflow soldering fixture is basically same with example 1, further more, the limiting plate 2 is screwed with a locating bolt 201, the locating bolt 201 is used to resist the circuit board 3 from above, the cavity 101 is arranged in the frame body 1, the connecting pipe 8 is installed in the cavity 101, the connecting pipe 8 is connected with multiple groups of branch pipes, the branch pipes are connected with the piston cylinder 4, and the electronic valve is installed in the branch pipe.

[0035] Through the setting of the locating bolt 201, the circuit board 3 can be secondarily fixed, the circuit board 3 is avoided from moving in the process of reflow soldering, or the air bag 6 is avoided from tilting the circuit board 3, and the welding effect is facilitated to improve.

[0036] The utility model discloses a piston cylinder 4 and the setting of air bag 6, through the continuous injection, make the air bag 6 on piston cylinder 4 continuously close to the element of circuit board 3 bottom, when two extrude contact, will make the pressure sensor 7 in air bag 6 inside send a signal, and then stop moving upward, the bottom of circuit board 3 is carried out to the upward lift, reduces the sinking of element under the action of self weight.

[0037] The above, only for the preferred specific implementation mode of the utility model, but the protection scope of the utility model does not limit to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme and the inventive concept of the utility model are equivalent to replace or change, all should be covered in the protection scope of the utility model.

Claims

1. A reflow soldering jig comprising a frame (1), a circuit board (3) mounted in the frame (1), characterized in that, Also include: Multiple sets of piston cylinder (4), fixed equidistantly connected in the frame (1); Air bag (6), fixedly connected to the telescopic end of the piston cylinder (4); Inner tube (401), connected in the piston cylinder (4), the inner tube (401) is connected with air bag (6); Pressure sensor (7), connected in the air bag (6); Connecting pipe (8), connected to the piston cylinder (4), the connecting pipe (8) is provided with an electronic valve at the connection of piston cylinder (4), through the connecting pipe (8) to the piston cylinder (4) gas supply, make the telescopic end of the piston cylinder (4) move up, in turn against the bottom of the circuit board (3) element.

2. The reflow soldering fixture of claim 1, wherein The frame (1) is connected with a limiting plate (2), the frame (1) and limiting plate (2) are provided with connecting hole.

3. The reflow soldering fixture of claim 2, wherein The frame (1) is provided with a recess, the circuit board (3) is clamped on the recess.

4. The reflow soldering fixture of claim 3, wherein The limiting plate (2) is threadedly connected with a positioning bolt (201), the positioning bolt (201) is used for resisting the circuit board (3) from above.

5. The reflow soldering tool of claim 1, wherein The frame (1) is provided with a cavity (101), the connecting pipe (8) is installed in the cavity (101).

6. The reflow soldering tool of claim 5, wherein The connecting pipe (8) is connected with multiple groups of branch pipes, the branch pipe is connected with the piston cylinder (4), and the electronic valve is installed in the branch pipe.

7. The reflow soldering tool of claim 1, wherein The telescopic end of the piston cylinder (4) is fixedly connected with a mounting plate (5), and the air bag (6) is installed on the mounting plate (5).

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